could rethread
Regular verb: rethread - rethreaded- rethreaded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could rethread
you could rethread
he could rethread
we could rethread
you could rethread
they could rethread 	I could be rethreading
you could be rethreading
he could be rethreading
we could be rethreading
you could be rethreading
they could be rethreading	I could have rethreaded
you could have rethreaded
he could have rethreaded
we could have rethreaded
you could have rethreaded
they could have rethreaded	I could have been rethreading
you could have been rethreading
he could have been rethreading
we could have been rethreading
you could have been rethreading
they could have been rethreading	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not rethread
you could not rethread
he could not rethread
we could not rethread
you could not rethread
they could not rethread 	I could not be rethreading
you could not be rethreading
he could not be rethreading
we could not be rethreading
you could not be rethreading
they could not be rethreading	I could not have rethreaded
you could not have rethreaded
he could not have rethreaded
we could not have rethreaded
you could not have rethreaded
they could not have rethreaded	I could not have been rethreading
you could not have been rethreading
he could not have been rethreading
we could not have been rethreading
you could not have been rethreading
they could not have been rethreading	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I rethread?
could you rethread?
could he rethread?
could we rethread?
could you rethread?
could they rethread? 	could I be rethreading?
could you be rethreading?
could he be rethreading?
could we be rethreading?
could you be rethreading?
could they be rethreading? 	could I have rethreaded?
could you have rethreaded?
could he have rethreaded?
could we have rethreaded?
could you have rethreaded?
could they have rethreaded? 	could I have been rethreading?
could you have been rethreading?
could he have been rethreading?
could we have been rethreading?
could you have been rethreading?
could they have been rethreading? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not rethread?
could you not rethread?
could he not rethread?
could we not rethread?
could you not rethread?
could they not rethread? 	could I not be rethreading?
could you not be rethreading?
could he not be rethreading?
could we not be rethreading?
could you not be rethreading?
could they not be rethreading? 	could I not have rethreaded?
could you not have rethreaded?
could he not have rethreaded?
could we not have rethreaded?
could you not have rethreaded?
could they not have rethreaded? 	could I not have been rethreading?
could you not have been rethreading?
could he not have been rethreading?
could we not have been rethreading?
could you not have been rethreading?
could they not have been rethreading?